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The Goodman 0130F00038 Auxiliary Limit Switch (identified by its light-blue body) is a genuine OEM secondary safety control for the AMVC800603BXAA gas furnace. This limit provides supplemental overheat protection beyond the primary limit — typically guarding the blower compartment or secondary heat-exchanger area — and shuts the furnace down if it detects abnormal temperatures.
The color-coded OEM 0130F00038 is factory-calibrated to the exact trip temperature this furnace circuit requires — the light-blue coding prevents mixing up limits with different set points. Substituting a generic or wrong-color limit risks nuisance shutdowns or defeated protection. For safety components, always use genuine OEM.
Easy (1/5). Two screws and spade connectors. Cut power and gas before servicing. Typical DIY time: 10–15 minutes.